Pinned-sucker-rod protector



y Z3,,1929- G. E. FENTRES 2 7 3459 PINNED SUCKER ROD PROTECTOR Filed Aug. 23, 1927 INVENTOR Patented May 28, 1929.

GEORGE E. FENTRESS, OF LOS ANGELES, GALIFORNIA.

PINNED-SUCKERIBOD PROTECTOR.

Application filed August 23, 1927. Serial No. 214,864..

The sucker rods by means of which oil well pumps are actuated are joined together by threaded pins and boxes which are of greater diameter than the rod itself. Projecting beyond the rod, these boxes rub against the well tubing and rapidly wear through, requiring constant replacement and often the loss of a string of rod. It is therefore desirable to place around the sucker rod, at frequent intervals in its length, protectors or sleeves of a diameter greater than that of the box, which will harmlessly take up the wear due to friction.

Such protectors, to be practical, must be cheaply constructed and, as they cannot he slipped over the upset end of the rod, must be in two or more parts so that'they can be assembled around the rod. Such a protector it is the object of my invention to provide.

A preferred application of my invention is illustrated in the attached drawings, in

which j Figure 1. illustrates in elevation a portion of a sucker rod with one of my improved protectors mounted thereon.

Figure 2 is a plan section ofmy protector on the line AA in Figure 1, and

Figure 3 is a plan section on the line B-B of Figure 1. I

Fig. 4 shows a split pin before and after insertion. 1

Referring to the drawings, 1 is an upset and threaded end of a rod, and 2 a portion of the body of a rod. 3-3 are preferably malleable iron castings havingthe four ribs 4: (shown in plan in Figure 3) and the dovetailing ring ends 5-5 (shown in plan in Figure 2).

Through these dovetails 'is formed a slot 6 on each side of the rod, the inner end of such slots (the ends directed towardthe middle of the length) being brought outto the surface of the dovetail end blocks. At said end these slot-s terminate in a chamber 7, of greater width than the slot-and having a pointed projection upward from its bottom as indicated at 8.

The two halves being dovetailed into each other around the rod, a split pin or wedge loosely fitting the slot 6 and nicked and split for a portion of its length as shown at 9 in Figure 4, is inserted in the slot and driven home. The nick coinciding with the point of the bottom projection of the chamber, the pin is wedged apart as shown at 10 in Fig ures-t and 1, thus locking the halves 'firmly together and preventing the pin from falling out.

The advantage of the ribs described is that they reduce the drag of the protector against the tubing wall and that they provide a relativelyfree passage for thefluid through and around the body of the protector. They are a desirable, but not a necessary, part of my invention.

claim as my invention:

1. A. sucker rod protector comprising: two

hubs for surrounding said rod, each hub formed of two dovetailing portions; tapered keys through said dovetailing portions for drawing said hub portions together in such manner that the rod is gripped between them, and a plurality of open ribs substantially parallel to and spaced from the rod and join-. ing said hubs.

2. A sucker rod protector comprising: two

hubs for surrounding said rod, each hub formed of two dovetailing portions; pins through said dovctailing portions for securing said portions together, and a plurality of open ribs substantially parallel to and spaced from said rod and joining said hubs.

3. A sucker rod protectorcomprising: two hubs for surrounding said rod, each hub formed of two dovetailing portions;. split tapered keys through saiddovetailing portions for drawing said hub portions together in such manner that the rod is. gripped .between them; means for spreading the split end of said keys, and a plurality of open ribs substantially parallel to and spaced from the rod and joining said hubs.

In witness that I claim the foregoing l have hereunto subscribed my name this 13th day of August, 1927.

. J GEORGE E. FENTRESS. 

